ask your doctor if including advair could help improve your lung function. [ male announcer ] advair diskus fluticasone propionate and salmeterol inhalation powder. get your first prescription free and save on refills at advaircopd.com. >>> there's growing evidence that the older tsarnaev brother was the leader of the two, influenced by his increasingly radical embrace of islam. brian todd has been looking into this part of the story for us. he's here in boston with me. what are you finding out? >> friends and acquaintances saying the younger brother, dzhokhar, was the follower of the two. we have incidents of the older brother, tamerlan tsarnaev, gave outbursts in his mosque in november and in january. new information on tamerlan tsarnaev's perspective on islam. january 18th, friday prayers at the islamic society of boston mosque in cambridge. a mosque leader is giving a service about the prophet mohammed and martin luther king jr. >> some people said that he said something to the effect that you cannot, you know, compare or make a parallel between our prophet and a nonmuslim. some